was
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was
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建立,建筑build 的被动语态例如：Its history was built upon its openness—it was for long the only place where Europeans could stop in Japan.它的历史构建与它的开放之上-它长久以来是欧洲人在日本能够停留的...
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已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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